Which part of the electromagnetic spectrum has the longest wavelengths? radio waves gamma rays infrared light ultraviolet light

The radius of the circle is 4 cm and the measure of the central angle is 90° the area of the sector with a central angle measuring 90° and radius of length 4 cm is vt cm the triangle in the sector is 4 cm the area of the triangle is v/cm² the area of the segment of the circle is (471 - ) cm?

Ill mark the brainliest if you me with the these three questions 7,8,9

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)